ADDITIONAL FEATURES

Additional Features

COMPLETE FREQUENCY TABLE

Midpoint

The midpoint of a class is the sum of the lower and upper limits of the class divided by two. The midpoint is sometimes called the class mark.

Relative frequency

The relative frequency of a class is the portion of the data that falls in that class.

The cumulative frequency of a class is the sum of the frequencies of that class and all previous classes. The cumulative frequency of the last class is equal to the sample size n.

Cumulative frequency

Using the frequency distribution of the last example, find the midpoint, relative frequency, and cumulative frequency of each class.

Example

Solution

Activity #8

Using the frequency distribution of the Activity #7, find the midpoint, relative frequency, and cumulative frequency of each class. Identify any pattern.